Claudia, Orzhov's Finest

Extort (Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever Claudia, Orzhov's Finest extorts, another target creature you control gets
+1/+1 and another target creature you don't control gets -1/-1 until end of turn.